Hydraulic parking mechanism of wheeled vehicle

Abstract

The utility model discloses a hydraulic parking mechanism of a wheeled vehicle, which solves the problems that the structure is relatively complicated and the installation is inconvenient due to the fact that the existing parking mechanism and the brake mechanism belong to two sets of systems and have no structural intersection between the parking mechanism and the brake mechanism. The structure comprises a pedal brake assembly and a hand brake assembly, the pedal brake assembly comprises a pedal plate and a brake master cylinder, the pedal plate is in transmission connection with the brake master cylinder, the brake master cylinder is communicated with front brake calipers through a front main oil pipe, and the brake master cylinder is communicated with rear brake calipers through a rear main oil pipe; the hand brake assembly comprises a parking hand brake. The parking hand brake is in transmission connection with the parking master cylinder, the rear main oil pipe passes through the parking master cylinder, and the parking hand brake acts on the rear brake calipers through the parking master cylinder and the rear main oil pipe; a one-way oil guide structure is formed between the parking master cylinder and the brake master cylinder on the rear main oil pipe and used for achieving conduction when hydraulic oil flows from the brake master cylinder to the parking master cylinder and stopping when the parking hand brake is pulled and the hydraulic oil flows reversely.

Description

Technical Field

[0001] This utility model relates to a wheeled vehicle, and more particularly to a hydraulic parking mechanism for achieving stable parking of a wheeled vehicle. Background Technology

[0002] Wheeled vehicles primarily operate in two states: parked and driving. When parked, to prevent rollover and improve safety, wheeled vehicles are typically equipped with a handbrake or electronic brake to enhance stability and safety. Standard wheeled vehicles usually use a mechanical parking system, where the handbrake is engaged, and a cable pulls the parking mechanism on the left and right brake calipers. Furthermore, the parking mechanism and the vehicle's braking system are two independent and parallel systems, not functionally compatible. This makes the parking and braking mechanisms of such wheeled vehicles relatively complex and difficult to install.

[0003] Chinese patent document (publication number: CN 217260527U) discloses a front drum and rear disc electric vehicle braking device, which solves the problems of poor safety and inconvenience in the use of existing electric vehicle braking devices. The technical solution adopted is as follows: A front drum and rear disc electric vehicle braking device includes an oil pump and a foot brake structure. A piston is provided in the oil pump. A first oil pipe connects the handbrake structure and the oil pump. A second oil pipe connects the oil pump and the disc brake structure. The foot brake structure includes a mounting bracket. A foot pedal is hinged on the mounting bracket. A return spring acts on the foot pedal and the mounting bracket. The foot pedal is driven by a pin. The pin acts on the piston. The characteristic is that one end of the brake cable is driven by the foot pedal and the other end is driven by the drum brake structure. Under the action of the foot pedal, the disc brake structure and the drum brake structure are linked.

[0004] This braking device itself uses a mechanical braking method. To achieve the parking function of a wheeled vehicle, a parking mechanism needs to be set up. The structure between the braking device and the parking mechanism is relatively complex and inconvenient to set up. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a hydraulic parking mechanism for wheeled vehicles. This parking mechanism can make good use of the existing structure of the braking device, has a compact overall structure, and good operational stability.

[0006] To solve the aforementioned technical problem, the present invention provides the following technical solution: a hydraulic parking mechanism for a wheeled vehicle, comprising a foot brake assembly and a handbrake assembly. The foot brake assembly includes a foot pedal and a master cylinder, the foot pedal being drivenly connected to the master cylinder. The master cylinder is connected to the front brake caliper via a front main hydraulic pipe and to the rear brake caliper via a rear main hydraulic pipe. The handbrake assembly includes a parking handbrake. The parking handbrake is characterized in that it is drivenly connected to the parking master cylinder, the rear main hydraulic pipe passes through the parking master cylinder, and the parking handbrake acts on the rear brake caliper through the parking master cylinder and the rear main hydraulic pipe. A one-way hydraulic guide structure is formed on the rear main hydraulic pipe between the parking master cylinder and the brake master cylinder, which allows hydraulic oil to flow from the brake master cylinder to the parking master cylinder, and to flow in the reverse direction when the parking handbrake is engaged.

[0007] When parking, operating the parking brake forces hydraulic oil to flow in the rear main hydraulic line, causing the rear brake calipers to grip the brake discs and bring the vehicle to a stop. The unidirectional hydraulic flow structure allows for bidirectional hydraulic oil flow during normal driving, facilitating the reset of the foot pedal. This can be achieved by a structure linked to the parking brake at the unidirectional hydraulic flow structure, allowing it to reverse and shut off when the parking brake is engaged. Alternatively, the reverse shut-off of the unidirectional hydraulic flow structure can be achieved by the pressure of the hydraulic oil; that is, when the parking brake is engaged, the pressure in the rear main hydraulic line increases, superimposed on the pressure of the hydraulic oil in the foot brake assembly, causing the hydraulic oil to reverse and shut off at the unidirectional hydraulic flow structure.

[0008] Furthermore, the parking master cylinder is equipped with a protruding parking pin, which is connected to one end of a rocker arm. The other end of the rocker arm is connected to the parking handbrake via a cable, and the middle of the rocker arm is pivotally connected to a support body. This handbrake assembly has a simple structure, is easy to install, and facilitates manual parking of the vehicle.

[0009] Furthermore, a vent valve is installed on the parking master cylinder at the position corresponding to the parking pin, and the vent valve is connected to the inside of the parking master cylinder. The vent valve releases some of the gas generated by the hydraulic oil in the rear main hydraulic line during operation, ensuring stable and accurate braking and parking during vehicle operation.

[0010] Furthermore, the master cylinder is equipped with two protruding brake pins. The protruding ends of these two brake pins are connected to the foot pedal. One brake pin controls the front brake caliper, and the other brake pin controls the rear brake caliper. These two brake pins are arranged in parallel. By using two brake pins to control the front and rear brake calipers respectively, the reaction force of the brake pins on the foot pedal can be effectively dispersed, resulting in good stability of the foot pedal operation.

[0011] Furthermore, at least one bleed valve is provided on the brake master cylinder, which is positioned corresponding to the brake pin and communicates with the inside of the brake master cylinder. This bleed valve is also used to release the gas generated in the brake master cylinder and the front master hose to prevent the accumulation of gas from affecting the stable operation of the pedal.

[0012] Furthermore, the brake master cylinder is connected to the two front brake calipers via two front main hydraulic lines; the rear main hydraulic line is connected to the two rear brake calipers via two rear branch hydraulic lines. The rear main hydraulic line and the two rear branch hydraulic lines are connected to a three-way balance valve. This allows each brake caliper to be controlled by its corresponding hydraulic circuit, resulting in good consistency in movement among the calipers, which is beneficial for the stable operation of the brake calipers and meets the requirements of actual working conditions.

[0013] Compared with existing technologies, this utility model has the following advantages: In this hydraulic parking mechanism, the parking assembly is integrated into the brake assembly, and some of their oil circuits are shared, effectively simplifying the structure of the oil circuits and making the hydraulic parking mechanism more concise. The foot pedal pushes hydraulic oil through the pipeline via the brake master cylinder, thereby engaging the brake caliper and brake disc. To achieve parking braking, the parking handbrake can be applied after the brake master cylinder has been activated, thus achieving stable parking and reducing the effort required to operate the parking handbrake. By setting the unidirectional oil guide structure, the control of the hydraulic oil flow direction during actual operation can be well met. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the hydraulic parking mechanism of this wheeled vehicle.

[0015] Figure 2 yes Figure 1 A cross-sectional view along the AA direction.

[0016] In the diagram, 1. Rear brake caliper; 2. Rear branch oil pipe; 3. Three-way balance valve; 4. Rear main oil pipe; 5. Parking handbrake; 6. Cable; 7. Rocker arm; 8. Support body; 9. Parking pin; 10. Parking master cylinder; 11. Foot pedal; 12. Brake pin; 13. Connecting bracket; 14. Brake master cylinder; 15. Front brake caliper; 16. Front main oil pipe; 17. Piston; 18. Piston ring; 19. Brake shoe; 20. Mounting bracket; 21. Bleeding valve. Detailed Implementation

[0017] Referring to the accompanying drawings, the hydraulic parking mechanism of this wheeled vehicle is used to stabilize the vehicle. The structure includes a foot brake assembly and a hand brake assembly, which share a portion of the structure to jointly brake the rear wheels.

[0018] The foot brake assembly includes a foot pedal 11 and a master cylinder 14. A connecting bracket 13 extends from the master cylinder 14, and the foot pedal 11 is hinged to the connecting bracket 13. The foot pedal 11 is kinetically connected to the master cylinder 14, and controls the operation of the master cylinder 14. The master cylinder 14 communicates with the front brake caliper 15 via a front master oil pipe 16, and with the rear brake caliper 1 via a rear master oil pipe 4. The handbrake assembly includes a parking handbrake 5, which is kinetically connected to the parking master cylinder 10. The rear master oil pipe 4 is connected to the pump body of the parking master cylinder 10, communicates with the parking master cylinder 10, and passes through the parking master cylinder 10. The parking handbrake 5 acts on the rear brake caliper 1 through the parking master cylinder 10 and the rear master oil pipe 4, causing the rear brake caliper 1 to engage with the brake disc at the corresponding position. A one-way oil guiding structure is formed on the rear master oil line 4 between the parking master cylinder 10 and the brake master cylinder 14. When the hydraulic oil flows from the brake master cylinder 14 to the parking master cylinder 10, the one-way oil guiding structure is open. When the parking handbrake 5 is pulled, the reverse flow of hydraulic oil is cut off. The power generated by the parking handbrake 5 is used to push the hydraulic oil towards the rear brake caliper 1, so that the rear brake caliper 1 has good stability and can provide a good parking effect.

[0019] The specific structure of the parking assembly is as follows: a parking master cylinder 10 has a protruding parking pin 9, which acts as a plunger. The axial movement of the parking pin 9 causes a change in the hydraulic oil pressure in the pipeline. A protruding support body 8 is located at a corresponding position inside the vehicle, and the middle part of the rocker arm 7 is pivotally connected to the support body 8. The parking pin 9 is driven to one end of the rocker arm 7, and the other end of the rocker arm 7 is driven to the parking handbrake 5 via a cable 6. When parking, pulling the parking handbrake 5 upwards causes the upper end of the rocker arm 7 to deflect away from the parking master cylinder 10 via the cable 6. The lower end of the rocker arm 7 pushes the parking pin 9 axially towards the interior of the parking master cylinder 10, thereby further tightening the rear brake caliper 1 against the brake disc through hydraulic oil. Before driving, releasing the parking handbrake 5 causes the corresponding structure to move in the opposite direction. Under the reverse action of the hydraulic oil, the brake caliper releases the brake disc, allowing normal driving.

[0020] A bleed valve 21 is provided on the parking master cylinder 10 at the position corresponding to the parking pin 9, and the bleed valve 21 communicates with the interior of the parking master cylinder 10. At least one bleed valve 21 is provided on the brake master cylinder 14, positioned corresponding to the brake pin 12, and the bleed valve 21 communicates with the interior of the brake master cylinder 14. The bleed valve 21 is used to release high-pressure gas accumulated in the corresponding pipeline. This is generally done manually. In high-end vehicles, the pressure in the corresponding pipeline can be monitored by a pressure sensor; alternatively, the need for bleeding can be determined based on actual user experience during use. This structure is typically used in relatively low-priced electric vehicles.

[0021] The master cylinder 14 contains two protruding brake pins 12, the protruding ends of which are connected to the foot pedal 11. One brake pin 12 controls the front brake calipers 15, and the other brake pin 12 controls the rear brake calipers 1. Under the action of the foot pedal 11, the two brake pins 12 simultaneously act on the two front brake calipers 15 and the two rear brake calipers 1, respectively, to achieve simultaneous braking and deceleration of all four wheels of the vehicle. The master cylinder 14 is connected to the two front brake calipers 15 via two front main brake lines 16; the rear main brake line 4 is connected to the two rear brake calipers 1 via two rear branch brake lines 2. The rear main brake line 4 and the two rear branch brake lines 2 are connected to a three-way balance valve 3.

[0022] Figure 2 The image shows a longitudinal sectional view of a rear brake caliper 1. In practical applications, Figure 1 The four brake calipers shown are basically identical in structure, including a mounting bracket 20, within which a piston 17 is slidably mounted, and a piston ring 18 is positioned between the mounting bracket 20 and the piston 17. The piston 17 is drivenly connected to a pair of brake shoes 19, one of which is fixed to the outer end of the piston 17, and the other is connected to the mounting bracket 20. When hydraulic oil is pressed into the mounting bracket 20, the mounting bracket 20 and the piston 17 move in opposite directions, causing the two brake shoes 19 to move towards each other, thus gripping the brake disc; conversely, the two brake shoes 19 release the brake disc.

Claims

1. A hydraulic parking mechanism for a wheeled vehicle, comprising a foot brake assembly and a handbrake assembly, the foot brake assembly including a foot pedal and a master cylinder, the foot pedal being tractively connected to the master cylinder, the master cylinder being connected to the front brake caliper via a front main hydraulic line, and the master cylinder being connected to the rear brake caliper via a rear main hydraulic line; the handbrake assembly including a parking handbrake, characterized in that, The parking handbrake is connected to the parking master cylinder, and the rear main hydraulic line passes through the parking master cylinder. The parking handbrake acts on the rear brake caliper through the parking master cylinder and the rear main hydraulic line. A one-way oil guiding structure is formed on the rear main hydraulic line between the parking master cylinder and the brake master cylinder to enable hydraulic oil to flow from the brake master cylinder to the parking master cylinder, and to cut off the hydraulic oil flow in the reverse direction when the parking handbrake is engaged.

2. The hydraulic parking mechanism for wheeled vehicles according to claim 1, characterized in that, The parking master cylinder is equipped with a protruding parking pin, which is connected to one end of a rocker arm. The other end of the rocker arm is connected to the parking handbrake via a cable. The middle part of the rocker arm is pivotally connected to the support body.

3. The hydraulic parking mechanism for wheeled vehicles according to claim 2, characterized in that, An air vent is located on the parking master cylinder at the position corresponding to the parking pin, and the air vent is connected to the inside of the parking master cylinder.

4. The hydraulic parking mechanism for wheeled vehicles according to claim 1, 2, or 3, characterized in that, The master cylinder is equipped with two protruding brake pins. The protruding ends of these two brake pins are connected to the foot pedal. One brake pin is used to control the front brake caliper, and the other brake pin is used to control the rear brake caliper.

5. The hydraulic parking mechanism for wheeled vehicles according to claim 4, characterized in that, At least one bleed valve is provided on the brake master cylinder, which is positioned corresponding to the position of the brake pin and is connected to the inside of the brake master cylinder.

6. The hydraulic parking mechanism for wheeled vehicles according to claim 1, 2, or 3, characterized in that, The brake master cylinder is connected to two front brake calipers via two front main hydraulic pipes; the rear main hydraulic pipe is connected to two rear brake calipers via two rear branch hydraulic pipes, and the rear main hydraulic pipe and the two rear branch hydraulic pipes are connected to a three-way balance valve.

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